Armchair



FIG. 1 is a perspective view of an armchair showing my new design;

FIG. 2 is a front perspective view;

FIG. 3 is a rear perspective view;

FIG. 4 is a right side perspective view;

FIG. 5 is a left side perspective view;

FIG. 6 is a top perspective view; and,

FIG. 7 is a bottom perspective view thereof.

The ornamental design for an armchair, as shown and described.